RESEARCH PAPER
Temperature sensitivity of respiration in biochar-amended soils with different textures, moisture levels and fertilizer treatments
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1
Institute of Agrophysics, Polish Academy of Sciences, Doświadczalna 4, 20-290 Lublin, Poland
2
School for Environment and Sustainability, University of Michigan, Ann Arbor, MI 48109, United States
3
UCD School of Agriculture and Food Science and UCD Earth Institute, University College Dublin, 4 Dublin, Ireland
Final revision date: 2026-02-17
Acceptance date: 2026-02-23
Publication date: 2026-05-25
Corresponding author
Anna Walkiewicz
Department of Natural Environment Biogeochemistry, Institute of Agrophysics, Polish Academy of Sciences, Poland
Int. Agrophys. 2026, 40(3): 305-319
HIGHLIGHTS
- Effects of biochar on Cmic depended on soil type, fertilization, and moisture
- Biochar amendments have the potential to slow organic C turnover
- Soil characteristics and temperature influenced the Q10 of soil respiration
KEYWORDS
TOPICS
ABSTRACT
Biochar additions change the temperature sensitivity (Q10) of soil respiration. The aim of this study was to assess the effects of biochar on the Q10 of CO2 emissions from fertilized sandy and silty loam soils with different moisture contents. Soil samples fertilized with NPK and NPK+manure (NPK+M) were incubated at temperatures of 5 to 15°C, and 15 to 25°C, under 60 and 100% water holding capacity (WHC). Microbial biomass C, pH and soil organic C concentration were measured in soils with and without biochar. The mean Q10 values varied from ~1 to 2 in most cases. The addition of biochar to silty loam affected the Q10 in the NPK+M treatment after 24 h, and the Q10 value increased from 0.90 to 1.36 at 5/15°C, while it decreased from 1.90 to 1.36 at 15/25°C. A similar effect of biochar was found with a sandy loam soil at 60% WHC. The lower Q10 for CO2 emissions after biochar application were particularly evident under higher temperatures and water saturated conditions. These results indicate that biochar can decrease the temperature sensitivity of native SOC mineralization and potentially enhance C sequestration in soils at higher temperatures.
FUNDING
This work was funded by the Polish National Centre for Research and Development within the ReLive project (CIRCULARITY/61/ReLive/2022).
CONFLICT OF INTEREST
The authors declare that they have no conflict of interest.
ADDITIONAL INFORMATION
Declaration of interest statement. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
Authors contributions: Conceptualization: A.W., A.K., A.R.; Methodology: A.W., A.K.; Formal analysis and investigation: A.W., A.K.; Writing: original draft preparation: A.W., M.G.; Writing: review and editing: A.K., A.R., B.O.; Funding acquisition: A.W., B.O.; Supervision: B.O. All authors have read and agreed to the published version of the manuscript.
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